Synthesis Of Polarization-enhanced Bismuth Oxybromide And Its Photocatalytic Oxidation Performance For Tetracyclin

Tetracycline antibiotics are tetrahydrobenzene derivatives with binary tetraphenyl structure which are the most common antibiotics in the world.With the development of the pharmaceutical industry,tetracycline is much abused.It seriously pollutes the natural environment.We urgently need a way to completely degrade tetracycline to properly deal with the pollution of tetracycline abuse.Bismuth oxybromide（BiOBr）is a narrow band gap semiconductor photocatalyst with layered structure.It has attracted much attention because its visible light response,high stability and high photocatalytic activity.However,in reality,the actual performance of BiOBr is not as strong as the theoretical performance because its high photogenerated carrier hole recombination rate.This work focuses on improving the photocatalytic activity of BiOBr.Composite material with（110）epitaxial growth was prepared by solvothermal method,in which zinc ferrite and MXene were added in situ.We mainly studied the relationship between material properties and material structure and photoelectric properties.It not only provides a new idea for the Fenton degradation of tetracycline,but also provides a new method and new material system for the design and regulation of materials.The main contents of this paper are as follows:（1）We synthesized BiOBr by simple solvothermal method,and doped zinc ferrite which was synthesized by hydrothermal method to form BiOBr/Zn Fe₂O₄（BOB/ZFO）material in situ.The purpose of using zinc ferrite is not only to improve the Fenton reaction efficiency,form heterojunction with BiOBr,reduce the photogenerated electron recombination rate of BiOBr,but also to use zinc ferrite magnetic field to induce and generate BiOBr with（110）crystal growth advantage which can enhance the built-in electric field of BiOBr.Experiments show that BOB/ZFO-10 composite has the highest degradation rate in this system.Under visible light irradiation,50 mg catalyst can degrade more than 99%50 mg/L tetracycline solution within 3 h,which is 3.58 times higher than BiOBr under the same conditions.Photoelectrochemical experiments also show that the photocurrent of composite BOB/ZFO-10 is 26.2 times higher than BiOBr.The impedance is also significantly smaller than BiOBr,which has more excellent photoelectric performance.（2）We synthesized BiOBr composite by simple solvothermal method.In the process of synthesizing BiOBr,Ti₂C was added to synthesize MXene-BiOBr（MX-BOB）composites in situ.As an emerging 2D material with excellent photoelectric properties,Ti₂C can not only be used as a cocatalyst to help BiOBr transfer photogenerated electrons,meanwhile,Ti₂C can also make BiOBr grow along the（110）crystal plane and enhance its built-in electric field.It is found that MX-BOB-3 material has the highest tetracycline degradation performance,which is 1.68 times higher than pure BiOBr.At the same time,photoelectrochemical experiments show that the composites have higher photocurrent,which is consistent with the degradation performance.